24 imac snow leopard backup on 27 iMac Lion? Can I restore system from backup?

Hi guys, I have a 24 inch iMac which came with preinstalled Snow Leopard. I am about to buy a new 27 iMac which I beleve comes with preinstalled Lion. I have been using time machine to fully back up my 24 inch iMac. What I want to know, is that when I buy my new 27 inch iMac, will I be able to restore it's system from my Snow leopard 24 inch imac backup? Please get back to me, thank you for your time

Start with Kappy's post here: https://discussions.apple.com/thread/3525616
As it says in the next-to-last paragraph, you can restore some things, but not others.
"Simple" apps, that were just dropped into the Applications folder, can be restored that way, but be careful not to replace any Snow Leopard versions with Lion versions -- they likely won't work.
"Complex" apps must be reinstalled from their original discs. See Transferring Applications for an explanation.
Some Snow Leopard apps won't work with the Lion file/folder structure. Mail is one for sure, and there may be others.
All told, you may be better off fixing whatever's wrong, if possible, and/or getting used to or finding workarounds for changes you don't like.

Similar Messages

"Restore system from backup" doesn't work

Hi folks! I've got a strange little problem and my normal rampage through Google hasn't dug up anything, so I figured I'd ask it here.
I currently have an early 2011 MacBookPro running 10.6.8 on an Intel SSD. A few days ago I figured I'd install an XP boot camp partition for the occasional bout of gaming (mmm... Skyrim... *dreamy look*)
So I made my Time Machine backup up-to-date, burned a CD with drivers, and let Disk Utility play with the partitions. Only thing was it said it couldn't do the job due to space issues and suggested I wipe the disk first.
Ok, no problem. My Time Machine backup was snug and secure and I've got plenty of install experience. I popped in the Lion DVD I'd burned for my other iMac and booted from it. Strangely, it give me an installation error (I guess it tries to install automatically without user interaction). But that's fine since I didn't want to install Lion anyway (I'm addicted to SL's Spaces). So I ran Disk Utility again with the partitions the way Boot Camp had advised (GUID, 2 partitions). This also worked without a problem.
Then I attempted the option "Restore system from backup" in the Utilities menu, and lo and behold: nothing happens. Nothing happened at all. No drive spin-up, no color wheel, no indication of any activity whatsoever. If I select any of the other options, it opens promptly, but clicking the restore option is as productive as a glob of ant spit on a meteor strike.
So I figure, still no worries, maybe the Lion disk has issues. So I take out my Snow Leopard DVD and boot from that. Never gave problems before, but alas: the iMac refuses to boot from it and starts throwing out 3 beeps every 5 seconds or so. (Googling the beeps pointed me to memory issues. Wait.. Whut?!?)
Okaaay. Then I tried it with my Leopard DVD. Once again, won't boot, beeps.
The Lion DVD seems to be the only DVD I can boot my mac from. The only thing I can guess at is that Apple prevents us from installing with older DVD's because of driver issues, which makes sense I guess. But I had Snow Leopard running fine up until now. I've tried several different partitioning schemes including the default one for an installation, but no cigar. Both Disk Utility and futil show both drives are visible and ok.
Anyone have any ideas? Thanks in advance for your time!
regards,
Meindert Honig

lepkitty wrote:
you should see the time machine come up and be able to select a date on the rite. the screen should look like its something out of star trek with several windows going back into a star like looking thing. if you see that then you want to do is select a date then click restore. you will be promoted that doing this will erase the computer, thats ok! its going to erase it and replace it with what your restoring.
You're mixing two very different things. You get the +Star Wars+ display, with the timeline on the right, only when browsing via +Enter Time Machine.+ Restoring something from there +*does not erase your entire computer!+* It only replaces what you've selected to restore.
If you do a full system restore (meaning boot volume), starting with your Install disc (per #14 in the Frequently Asked Questions *User Tip,* also at the top of this forum), there is no "Star Wars" display, and only the drive/partition that you select as a destination for the restore is erased.

Recovering Mac HD via Time Machine Backup fails because "Restore system from backup" doesn't show in Utilities Menu of original install. DVD

Hi, after serious problems (troubleshooting didn't help) with my iMac G5 (PPC) running Mac OS X Leopard I've tried to recover my Mac HD via Time Machine (exactly as described by David Pogue on page 242 of the Leopard Missing Manual). However, "Restore system from backup" in the Utilities Menu of my original Leopard installation DVD failed to show up. What can I do?
Any assistance will be greatly appreciated -
Ballant

Hi Ballant,
I'm not very good with TM, nor a fan of it, but our resident king of TM, Pondini, has a vast array of very well done TM trouble shootings...
http://pondini.org/TM/Troubleshooting.html

Restoring System from Backup

When the mac os x cd installer is running you can go to "Utilities" and "Restore System from Backup". Does this command install snow leopard and then add the time machine files or does it just restore the files (meaning you will have to install Snow Leopard first).

Have a read here How do I restore my entire system?
It restores both the OSX system and the user files (applications and data).
Stefan

HT4859 how can i restore files from backup after i reset my ipod touch?

I rebooted my ipod touch how can i restore my back up files

Welcome to the Apple community.
Rebooting your device is not the same as restoring it, to restore a device go to settings > general > reset > erase all contents and settings. Once you do this you will then be given the option to restore it from a backup or as a new iPod.

How can I restore contacts from Backup Assistant

My contact list has been corrupted. I have been using Backup Assistant for some time and want to restore my contacts from a previous backup.
Verizon seems to have changed BA since the last time I used it and the only function seems to be to take my corrupted contact list from my phone and store it. Any suggestions on recovering my non-corrupted contact list?

Here is a reply from a VW CS regarding the same question a few months back:
Click this link Backup Assistant (sign in) to check if contacts are available. You may sync directly from the site, by simply clicking sync on the right hand side (above contacts).
You may also try to sync by adding your G-mail account to the your device then go to Settings > Accounts & Sync > Ensure Sync is on for G-mail account. You may also select Auto-sync.
For additional information on how to restore contacts, click the link below:
Backup Assistant

[Solved] Restore system from backup using rsync

I am thinking about installing Windows on my computer and I know it work's better to install Windows first, then arch. That being said, I will likely reformat my system, install windows and then reinstall arch. I've made many configurations that I would like to keep but not have to re-implement (it takes a while to set things up!) once I have the fresh arch install. I know from https://wiki.archlinux.org/index.php/Fu … with_rsync that I can use:
sudo rsync -aAXv /* /path/to/backup/folder --exclude={/dev/*,/proc/*,/sys/*,/tmp/*,/run/*,/mnt/*,/media/*,/lost+found}
in order to backup all important parts of my system. Before doing any reformatting I will run this script to backup my system to an external drive. However, after I have reformatted, installed windows and then arch, what is the correct/efficient way to put the backup files (on the external drive) back into the newly installed system? Even if I set up the partitions (associated to arch) during installation in exactly the same way (albeit they would be smaller since Windows would now occupy some space), I'd imagine that the command:
sudo rsync -aAXv /path/to/backup/folder/on/external/drive/* /
would cause some epic failure? Even if I modified the UUID's in the fstab before rebooting? Would this strategy work if I only rsync'ed a subset of the backup files contained in the external drive (e.g. /home, /etc, /var, ...)? If another strategy, apart from rsync, is best, please let me know. Thanks for your help!
Last edited by jayflo (2013-10-02 22:49:57)

I understand that after rsync'ing the backup files (on the external drive) to the fresh install, that I need to update the fstab (since the UUID's changed). However, if I rsync over the /boot directory, then the backup copy of
/boot/grub/grub.cfg
will now be part of the arch system on my computer. I have a couple questions:
1) If I rsync'd everything except /boot/grub/grub.cfg, what about the fresh install grub.cfg file needs to be updated? Does it also have old UUID's within it that need to be updated?
2) Does the command
grub-mkconfig -o /boot/grub/grub.cfg
generate the grub.cfg using /etc/fstab (if at all)? Or does it load the information (which needs to be updated) from some other (memory) source? If it is the latter, would I need to restart my computer (after rsync and updating fstab) before generating grub.cfg? (and...restarting wouldn't work at this point since I have would not have updated the grub.cfg?)

Can't find Restore System from Backup In utilities

Ok I messed up my os and I need to do a restore system from back up I can't seem to find the restore system from back option in my utilities when i am running the installer with the os installer disk and when i have my external hooked up it just wants me to install in to that thing I don't know what that would do. I have read the article about restoring the entire system and that what I need to do but I can 't because my messed up os wont let me restart/shutdown with out pushing the power button I am tempted to just erase and install but I don't even know how restore with my time machine and plus i am scared to do it
any help would be most welcome i have been trying to fix this for about month now

I almost understand what you wrote, but it's so confusingly written I'm not sure how to reply. So give this a try:
How to Perform an Archive and Install
An Archive and Install will NOT erase your hard drive, but you must have sufficient free space for a second OS X installation which could be from 3-9 GBs depending upon the version of OS X and selected installation options. The free space requirement is over and above normal free space requirements which should be at least 6-10 GBs. Read all the linked references carefully before proceeding.
1. Be sure to use Disk Utility first to repair the disk before performing the Archive and Install.
Repairing the Hard Drive and Permissions
Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger.) After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported, then quit DU and return to the installer.
2. Do not proceed with an Archive and Install if DU reports errors it cannot fix. In that case use Disk Warrior and/or TechTool Pro to repair the hard drive. If neither can repair the drive, then you will have to erase the drive and reinstall from scratch.
3. Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When you reach the screen to select a destination drive click once on the destination drive then click on the Option button. Select the Archive and Install option. You have an option to preserve users and network preferences. Only select this option if you are sure you have no corrupted files in your user accounts. Otherwise leave this option unchecked. Click on the OK button and continue with the OS X Installation.
4. Upon completion of the Archive and Install you will have a Previous System Folder in the root directory. You should retain the PSF until you are sure you do not need to manually transfer any items from the PSF to your newly installed system.
5. After moving any items you want to keep from the PSF you should delete it. You can back it up if you prefer, but you must delete it from the hard drive.
6. You can now download a Combo Updater directly from Apple's download site to update your new system to the desired version as well as install any security or other updates. You can also do this using Software Update.

My Blocked Sender list got erased. How can I restore it from backup?

Where is the Blocked Sender List file located and what is it's name?

It's not in Firefox. Firefox doesn't do email, it's strictly a web browser.
If you are using Firefox to access your mail, you are using "web-mail". You need to seek support from your service provider or a forum for that service.
If your problem is with Mozilla Thunderbird, see this forum for support.
[http://www.mozillamessaging.com/en-US/support/] <br />
or this one <br />
[http://forums.mozillazine.org/viewforum.php?f=39]

Can't restore iphone from backup because wifi won't work to turn off find my phone

Original problem is wifi is greyed out. I tried several methods and I want to try restoring phone from back up. It won't allow me to because I can not turn the find my phone off because wifi is greyed out! Help I do not know if it is a 4 or 4s

Danaday76 wrote:
... It won't allow me to because I can not turn the find my phone off because wifi is greyed out.
You can access iCloud.com on a computer to turn it off.
http://support.apple.com/kb/PH2702

My Imac fails when I try to upgrade from Snow Leopard 10.6.8. I have to boot up from disk. Does anyone know how to overcome this problem?

My iMac fails when I try to upgrade from Snow Leopard 10.6.8. I have to boot up from disk. Does anyone know how to overcome this problem?   I need to upgrade in order to install latest software.

It would be lovely to know what your talking about. Upgrading from Snow Leopard does not involve discs.
Upgrading to Lion
If your computer does not meet the requirements to install Mavericks, it may still meet the requirements to install Lion.
You can purchase Lion at the Online Apple Store. The cost is $19.99 (as it was before) plus tax. It's a download. You will get an email containing a redemption code that you then use at the Mac App Store to download Lion. Save a copy of that installer to your Downloads folder because the installer deletes itself at the end of the installation.
     Lion System Requirements
       1. Mac computer with an Intel Core 2 Duo, Core i3, Core i5, Core i7,
           or Xeon processor
       2. 2GB of memory
       3. OS X v10.6.6 or later (v10.6.8 recommended)
       4. 7GB of available space
       5. Some features require an Apple ID; terms apply.
Upgrading to Mountain Lion
To upgrade to Mountain Lion you must have Snow Leopard 10.6.8 or Lion installed. Purchase a redemption code at the Online Apple Store: OS X Mountain Lion. Mountain Lion is $19.99 plus tax. Use the code to redeem a download of Mountain Lion from the App Store. The file is quite large, over 4 GBs, so allow some time to download. It would be preferable to use Ethernet because it is nearly four times faster than wireless.
     OS X Mountain Lion - System Requirements
       Macs that can be upgraded to OS X Mountain Lion
         1. iMac (Mid 2007 or newer) - Model Identifier 7,1 or later.
         2. MacBook (Late 2008 Aluminum, or Early 2009 or newer) - Model
             Identifier 5,1 or later.
         3. MacBook Pro (Mid/Late 2007 or newer) - Model Identifier 3,1 or later.
         4. MacBook Air (Late 2008 or newer) - Model Identifier 2,1 or later.
         5. Mac mini (Early 2009 or newer) - Model Identifier 3,1 or later.
         6. Mac Pro (Early 2008 or newer) - Model Identifier 3,1 or later.
         7. Xserve (Early 2009) - Model Identifier 3,1 or later.
To find the model identifier open System Profiler in the Utilities folder. It's displayed in the panel on the right.
     Are my applications compatible?
         See App Compatibility Table - RoaringApps.
Upgrading to Yosemite
You can upgrade to Yosemite from Lion or directly from Snow Leopard. Yosemite can be downloaded from the Mac App Store for FREE.
Upgrading to Yosemite
To upgrade to Yosemite you must have Snow Leopard 10.6.8 or Lion installed. Download Yosemite from the App Store. Sign in using your Apple ID. Yosemite is free. The file is quite large, over 5 GBs, so allow some time to download. It would be preferable to use Ethernet because it is nearly four times faster than wireless.
    OS X Mavericks/Yosemite- System Requirements
    Macs that can be upgraded to OS X Yosemite
         1. iMac (Mid 2007 or newer) - Model Identifier 7,1 or later
         2. MacBook (Late 2008 Aluminum, or Early 2009 or newer) - Model Identifier 5,1 or later
         3. MacBook Pro (Mid/Late 2007 or newer) - Model Identifier 3,1 or later
         4. MacBook Air (Late 2008 or newer) - Model Identifier 2,1 or later
         5. Mac mini (Early 2009 or newer) - Model Identifier 3,1 or later
         6. Mac Pro (Early 2008 or newer) - Model Identifier 3,1 or later
         7. Xserve (Early 2009) - Model Identifier 3,1 or later
To find the model identifier open System Profiler in the Utilities folder. It's displayed in the panel on the right.
     Are my applications compatible?
         See App Compatibility Table - RoaringApps.

I already have snow leopard 10.6.8 but i can't upgrade to Mavericks. Why??

I can't upgrade my mac anymore. Is it supposed to be like this with snow leopard, or have I not met any of the requirements (I don't understand since I clearly have 2GB of memory and 223GB of free space) Do I have to upgrade it to Lion or Mountain Lion first or something??

Upgrading to Mavericks
You can upgrade to Mavericks from Lion or directly from Snow Leopard. Mavericks can be downloaded from the Mac App Store for FREE.
Upgrading to Mavericks
To upgrade to Mavericks you must have Snow Leopard 10.6.8 or Lion installed. Download Mavericks from the App Store. Sign in using your Apple ID. Mavericks is free. The file is quite large, over 5 GBs, so allow some time to download. It would be preferable to use Ethernet because it is nearly four times faster than wireless.
    OS X Mavericks- System Requirements
    Macs that can be upgraded to OS X Mavericks
         1. iMac (Mid 2007 or newer) - Model Identifier 7,1 or later
         2. MacBook (Late 2008 Aluminum, or Early 2009 or newer) - Model Identifier 5,1 or later
         3. MacBook Pro (Mid/Late 2007 or newer) - Model Identifier 3,1 or later
         4. MacBook Air (Late 2008 or newer) - Model Identifier 2,1 or later
         5. Mac mini (Early 2009 or newer) - Model Identifier 3,1 or later
         6. Mac Pro (Early 2008 or newer) - Model Identifier 3,1 or later
         7. Xserve (Early 2009) - Model Identifier 3,1 or later
To find the model identifier open System Profiler in the Utilities folder. It's displayed in the panel on the right.
     Are my applications compatible?
         See App Compatibility Table - RoaringApps.
Upgrading to Lion
If your computer does not meet the requirements to install Mavericks, it may still meet the requirements to install Lion.
You can purchase Lion at the Online Apple Store. The cost is $19.99 (as it was before) plus tax. It's a download. You will get an email containing a redemption code that you then use at the Mac App Store to download Lion. Save a copy of that installer to your Downloads folder because the installer deletes itself at the end of the installation.
     Lion System Requirements
       1. Mac computer with an Intel Core 2 Duo, Core i3, Core i5, Core i7,
           or Xeon processor
       2. 2GB of memory
       3. OS X v10.6.6 or later (v10.6.8 recommended)
       4. 7GB of available space
       5. Some features require an Apple ID; terms apply.

Upgrade MacBook Hard Drive - Restore System from Time Machine Backup?

I have a MacBook that I want to upgrade the hard drive of. Am I right in thinking, all I need to do is:
Run Time Machine one last time, to make a recent backup of the MacBook
Install the new hard drive in the MacBook
Insert the Snow Leopard DVD, and start a clean installation
During installation, select the option to Restore System From Backup...
Will this copy across ALL of the contents of the old MacBook's hard drive, to the new MacBook's hard drive? A perfect clone? Because that's what I want to do.

I performed the installation, restoring a Time Machine backup from the external hard drive to the new blank internal one I put inside the MacBook. Everything went fine, except for one problem.
Now, whenever I try to open Safari, it immediately crashes with the error message:
"Safari quit unexpectedly
Exception Type: EXC_BAD_ACCESS (SIGSEGV)"
What's going on? How can I stop Safari from doing this? I've repaired permissions using Disk Utility, and Spotlight has finished re-indexing everything.

All 30 minutes my Macs (iMac/Snow Leopard, MacMini/Lion) are loosing the connection to the Windows Servers (2 Networks: Home with Home Server 2011 (Server 2008) and Office with Home Server V1 (Server 2003)).

Hallo,
Ich betreibe im Büro und zu Hause jeweils einen Microsoft Home Server. In beiden Netzwerken ist neben diversen Windows Rechnern auch ein Mac vorhanden.
Die jeweilige "Konfiguration" ist wie folgt:
- Apple MacMini (Late 2011, als HTPC) mit Lion per Wlan über AVM Fritzbox 7390 an Microsoft Windows Home Server 2011 (Windows Server 2008).
- Apple iMac (Late 2010, Arbeitsplatzrechner) mit Snow Leopard per Lan über AVM Fritzbox 7270 an Microsoft Windows Home Server V1 (Windows Server 2003)
Alle Betriebssysteme sind auf aktuellem Stand.
Die Fritzboxen laufen mit der jeweils aktuellen Firmware
Nun zu dem Problem:
Beide Macs unterbrechen ca. alle 30 min den Kontakt zum Server. Die Verbindung wird zwar ca. 1-2 Minute später wieder aufgebaut, aber am MacMini (HTPC) macht sich dadurch bemerkbar, daß der Film oder die Musik für obige Zeitspanne stoppt und danach weiterläuft. Beim iMac (Arbeitsrechner) kann ein zuvor vom Server geladenes Dokument dann nicht mehr gespeichert oder gedruckt werden.
Der MacMini hat dieses Phänomen direkt bei der Verbindung mit dem WHS gezeigt. Der iMac hat jedoch zuvor ca. 1,5 Jahre ohne Probleme funktioniert. Dieses Problem tritt bei dem iMac (Snow Leopard) erst seit ca. 6-9 Monate auf.
Da unterschiedliche WHS und OS X Versionen betroffen sind und auch unterschiedliche Fritzboxen verwendet werden und scheint ein allgemeines Problem im Zusammenspiel Windows/OS X vorzuliegen.
Bei dem iMac fällt der genaue Zeitpunkt der Verbindungsunterbrechung nicht auf.
Bei dem MacMini läßt sich der Zeitpunkt dagegen relativ leicht bestimmen. Aus der Ereignisanzeige beim Windows Server ergibt sich leider kein eindeutiges Fehlerbild. Zu dem jeweiligen Zeitpunkt taucht aber relativ oft, aber nicht immer (!), in "Windows-Protokolle Sicherheit" der Fehler 4625 ("Fehler beim Anmelden eines Kontos") auf. Dies würde auf eine Rechteproblematik hindeuten. Das Konto des Mac kann aber alles was ihm auf dem WHS erlaubt ist.
Beim Suchen nach einer Lösung (bisher leider erfolglos) bin ich u.a. auch über das Problem des Server Infrastructure License Services (silsvc) beim Windows Small Business Server 2011 Essentials gestolpert (auch alle 30 min!). Vielleicht ein Zusammenhang?
Hello,
I run the office and at home each a Microsoft Home Server. In both networks, in addition to various Windows computers, a Mac is available.
The particular "configuration" is as follows:
- Apple MacMini (Late 2011, as HTPC) with Lion via wifi via AVM Fritzbox 7390 to Microsoft Windows Home Server 2011 (Windows Server 2008).
- Apple iMac (Late 2010, desktop PC) with Snow Leopard by Lan on AVM Fritzbox 7270 on Microsoft Windows Home Server V1 (Windows Server 2003)
All operating systems on current conditions with all patches and updates.
The Fritz boxes running with the latest firmware
Now to the problem:
Both Macs are loosing every 30 minutes the contact to the server. The connection is "re-"established about 1-2 minutes later. On MacMini (HTPC), the film or music is stopped for the above period. Thereafter, the film / music goes on. With the iMac (workstation) a document loaded from the server can no longer be saved or printed.
The MacMini has shown this phenomenon directly in connection with the WHS. However, the iMac has been working about 1.5 years with no problems. This problem only occurs for about 6-9 months
Because of different WHS and OS X versions are affected and also different Fritz boxes are used and it seems to be a general problem in the interplay Windows / OS X to be present.
When the iMac is the exact date of disconnection does not occur.
With the Mac Mini, the time can however be determined relatively easily. From the Event Viewer on Windows Server is unfortunately no clear error image. At the particular time but appeared relatively often, but not always (!) In Windows Security Logs the error 4625 (Failed to log on an account) on. This would indicate a rights issue.
Searching for a solution (so far unsuccessfully, unfortunately), I stumbled over the problem of the Server Infrastructure License Services (silsvc) in Windows Small Business Server 2011 Essentials (every 30 min!). Maybe a connection?

Hi, and thank you for your reply!
My reason for not posting this in the server forum is that I suspect it is a clien issue. All my other clients connect happily to the server which leads me to believe the server is configured correctly.
Only my the two MacBook Pro's are having problems.

If have MBA (lion), imac (Snow Leopard), iphone (ios 4) will icloud sync all three?

I have a Mobile Me account. Will MBA (lion), imac (snow leopard), iphone 3s (ios 4) synch from icloud?
Thanks

At it's heart Lion is OS X. Yes it has new features and like any product you may like some and not have a use for others. The IOS desktop look alike on Lion is called Mission Control, while I've played with it I have no need for it either and rarely if ever look at it. However for someone that has used OS X for several years it's not necessary, my guess is it's designed for those that want to transition from a IOS device to a Mac.
The success of any major upgrade is in the preparation. You have done one of the first steps to see your software is up-to-date. You may want to check with the apps you use frequently and see if they have updates too. I use a free tool called AppFresh that survey's all the apps on my computer and lets me know if updates are available. You can download AppFresh from Macupdate.com if you are interested. Next make sure your computer meets Lion System requirements which are:
Mac OS X Lion System Requirements
In order to install Mac OS X 10.7 you will need:
Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon processor
2GB of RAM (I'd recommend 4GB or more)
Mac OS X 10.6.6 or later with the Mac App Store installed
At least 4GB of additional disk space to accommodate the download, but more is obviously recommended
Once your machine has met the hardware and software requirements then you're ready to get Lion installed. As with any update again do a little preparation, I'd recommend using the suggestions in this Update Process post. This all sounds like a lot of work but it makes for a fun Saturday afternoon project if you like to tinker a bit.

24 imac snow leopard backup on 27 iMac Lion? Can I restore system from backup?

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